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3 天前 · The uncertainty principle, also known as Heisenberg's indeterminacy principle, is a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum, can be simultaneously known.
3 天前 · Polynesia is one of three major cultural areas of the Pacific Ocean islands, along with Melanesia and Micronesia. Subregions ( Melanesia, Micronesia, Polynesia, and Australasia ), as well as sovereign and dependent islands of Oceania. Polynesia is generally defined as the islands within the Polynesian Triangle.
1 天前 · Portland ( / ˈpɔːrtlənd / PORT-lənd) is the most populous city in the U.S. state of Oregon, located in the Pacific Northwest region. Situated in the northwestern area of the state at the confluence of the Willamette and Columbia rivers, it is the county seat of Multnomah County, Oregon's most populous county.
1 天前 · Geneva (/ dʒ ə ˈ n iː v ə / jə-NEE-və, Arpitan: [dzəˈnɛva] ; French: Genève ) is the second-most populous city in Switzerland (after Zürich) and the most populous of the French-speaking Romandy.Situated in the southwest of the country, where the Rhône exits Lake Geneva, it is the capital of the Republic and Canton of Geneva, and a centre for international diplomacy.
1 天前 · Istanbul. / 41.01361°N 28.95500°E / 41.01361; 28.95500. Istanbul, [a] is the largest city in Turkey, straddling the Bosporus Strait, the boundary between Europe and Asia. It is considered the country's economic, cultural and historic capital. The city has a population of over 15 million residents, comprising 19% of the population of ...
2 天前 · The Shinkansen ( Japanese: 新幹線, [ɕiŋkaꜜɰ̃seɴ] ⓘ, lit. 'new main line'), colloquially known in English as the bullet train, is a network of high-speed railway lines in Japan. Initially, it was built to connect distant Japanese regions with Tokyo, the capital, to aid economic growth and development.
3 天前 · Silicon Valley is a region in Northern California that is a global center for high technology and innovation. Located in the southern part of the San Francisco Bay Area, it corresponds roughly to the geographical area of the Santa Clara Valley.
